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drm/i915: Add intel_dotclock_calculate()
Extract the code to calculate the dotclock from the link clock and M/N
values into a new function from ironlake_crtc_clock_get().
The new function can be used to calculate the dotclock for both FDI and
DP cases.
Also simplify the code a bit along the way.
v2: Don't forget about non-pch encoders in ironlake_crtc_clock_get()
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>